Scalar-tensor quantum gravity in two dimensions
نویسندگان
چکیده
منابع مشابه
Hyperextended scalar-tensor gravity.
We study a general Scalar-Tensor Theory with an arbitrary coupling funtion !( ) but also an arbitrary dependence of the gravitational constant G( ) in the cases in which either one of them, or both, do not admit an analytical inverse, as in the hyperextended in ationary scenario. We present the full set of eld equations and study their cosmological behavior. We show that different scalar-tensor...
متن کاملSingularities in scalar - tensor gravity
The analysis of certain singularities in scalar-tensor gravity contained in a recent paper is completed, and situations are pointed out in which these singularities cannot occur. Recently, Abramo et al. [1] have investigated certain geometric singularities occurring in the gravitational sector of scalar-tensor theories described by the action
متن کاملQuantum R Gravity in Two Dimensions
Two-dimensional quantum gravity with an R2 term is investigated in the continuum framework. It is shown that the partition function for small area A is highly suppressed by an exponential factor exp{−2π(1 − h)2/(m2A)}, where 1/m2 is the coefficient (times 32π) of R2 and h is the genus of the surface. Although positivity is violated, at a short distance scale ( ≪ 1/m) surfaces are smooth and the...
متن کاملScalar-Tensor Gravity in Two 3-brane System
We derive the effective four-dimensional gravity action in the RandallSundrum scenario in which two 3-branes of opposite tension reside in a fivedimensional spacetime. The dimensional reduction with the Ansatz for the radion field by Charmousis et al., which solves five-dimensional linearized field equations, results in a class of scalar-tensor gravity theories. In the limit of vanishing radion...
متن کامل1/R gravity and Scalar-Tensor Gravity
We point out that extended gravity theories, the Lagrangian of which is an arbitrary function of scalar curvature R, are equivalent to a class of the scalar tensor theories of gravity. The corresponding gravity theory is ω = 0 BransDicke gravity with a potential for the Brans-Dicke scalar field, which is not compatible with solar system experiments if the field is very light: the case when such...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1992
ISSN: 0550-3213
DOI: 10.1016/0550-3213(92)90187-g